The Phottix Strato 4-in-1 Wireless Trigger System gives photographers incredible control over their flashes and studio lights. The four channels provide unparalleled control in the studio or on location. The Strato can be used as a wired or wireless shutter release. The 2.4 GHz transmitter and receivers offer ranges of more than 100 meters and sync at speeds of 1/250 second. Transmitters feature an innovative TTL pass-through hot shoe - allowing full TTL mode to be used with a camera mounted flash. Receivers offer flash wake-up functions.